State whether True or False.
Work is said to be done when a force is applied, even if the object does not move.
False. Work is only done when there is displacement in the direction of the applied force. If the object does not move, the displacement is zero, making the work done zero.
Lifting a bucket vertically upward results in positive work done on the bucket.
True. When lifting a bucket vertically upward, the applied force and the displacement are in the same direction, which results in positive work done on the bucket.
The SI unit for both work and energy is joule (J).
True. The SI unit for both work and energy is the joule (J).
A motionless stretched rubber band has kinetic energy.
False. A motionless stretched rubber band has zero velocity, so it possesses potential energy, not kinetic energy. Kinetic energy depends on the velocity of the object.
Energy can change from one form to another.
True. Energy can change from one form to another, such as potential energy transforming into kinetic energy, as implied by the conservation of mechanical energy.
Explanation
The answers are derived directly from the definitions and examples provided in the context. Work requires displacement in the direction of force; without movement, work is zero. Positive work occurs when force and displacement are in the same direction, such as lifting an object. Kinetic energy requires motion (velocity), while a stretched rubber band at rest stores potential energy. Energy transformation is a fundamental concept supported by the conservation of mechanical energy mentioned in the text.